4.7: hvel=v2/2g the units will be meters of diesel oil. That is not a standard unit to measure head. It is usually measured in meters of water or Hg. To make the conversion convert first to a dynamic pressure, in Pa. Pd=head*specific weight of water (H20. Head in Hg=Pd/specific weight of Hg

4.8 Total Head=Pressure head+Velocity head+potential head + friction head